CVE-2026-73483
Received Received - Intake

Sandbox Escape in Flowise via Puppeteer Command Injection

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: VulnCheck

Description
Flowise (packages flowise and flowise-components) in versions <= 3.1.2 contain a sandbox escape in the vm2/@flowiseai/nodevm JavaScript sandbox. An authenticated user with access to the /api/v1/node-custom-function endpoint can escape the sandbox by supplying attacker-controlled executablePath and args parameters to puppeteer.launch(), which internally invokes child_process.spawn() outside the sandbox boundary. This allows execution of arbitrary OS commands as the Flowise process user (root in the official Docker image) and arbitrary host file disclosure via Chromium's file:// URL handling. In versions 3.0.8–3.1.2 exploitation requires ALLOW_BUILTIN_DEP=true; earlier versions are exploitable by default. Fixed in 3.1.3.

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-73483
EUVD
EUVD-2026-57799

Affected Vendors & Products

Showing 8 associated CPEs
Vendor Product Version / Range
flowise flowise to 3.1.2 (inc)
flowise flowise From 3.0.8 (inc) to 3.1.2 (exc)
flowise flowise 3.1.3
flowise flowise-components to 3.1.2 (inc)
flowise flowise-components From 3.0.8 (inc) to 3.1.2 (exc)
flowise flowise-components 3.1.3
flowiseai flowise to 3.1.2 (inc)
flowiseai flowise From 2.0.0 (inc) to 3.1.3 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

This vulnerability is a sandbox escape in Flowise versions <= 3.1.2. An authenticated user with access to the /api/v1/node-custom-function endpoint can escape the JavaScript sandbox by providing attacker-controlled parameters to puppeteer.launch(). This allows execution of arbitrary OS commands as the Flowise process user (root in Docker) and arbitrary file disclosure via file:// URLs.

Detection Guidance

Check Flowise version with 'npm list flowise' or 'docker inspect <container> | grep Image'. Inspect network traffic for requests to /api/v1/node-custom-function with suspicious payloads. Review logs for unexpected child_process.spawn or puppeteer.launch calls.

Impact Analysis

An attacker could execute arbitrary OS commands on the host system as root, potentially taking full control of the server. They could also read sensitive files on the host system, leading to data breaches or further compromise of the environment.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements. It may result in data breaches, unauthorized disclosure, and non-compliance with regulatory standards.

Mitigation Strategies

Upgrade Flowise to version 3.1.3 or later immediately. If unable to upgrade, disable the /api/v1/node-custom-function endpoint or restrict access to authenticated users only. Remove puppeteer and playwright from allowlists if ALLOW_BUILTIN_DEP=true is set.

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